Dynamic addition of a View [Android] from background thread

Question

I am creating an animated drawable and then adding it to a FrameLayout. The variable is created as a class field and then, each new AnimatedDrawable is created and added to the frame, like that :

for (int i = 0; i < 10; i++) {
sampleView = new SampleView(Drink.this);
frame.addView(sampleView);
}

But when I do that from the background thread (AsyncTask in which I run the frame.addView(sampleView); in runOnUIThread to avoid issue of updating UI from another thread than UI's), I get an error unless I add this to my code : frame.removeView(sampleView);

So, I can't grab the issue here...More over, when I do that, instead of getting 10 elements, I only get 3...

The error I get is the classical :

java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.